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Centre Stand seized pin fix?
McCabe-Thiele (Ted):
When I was removing my old pin I also made use of my mains impact drill - in my case I had an SDS masonary bit that was just about the right size it helped shift it - once it had started to move it became increasingly easy to get it to drive out. This was after two horizontal saw cuts as I recall.
AshimotoK0:
Well my SDS adapters haven't arrived yet, so soldiered on drilling the seized pins out.
I have now removed 3 pins in 3 off CB250/350K centre stands, by drilling out with a really nice quality drill bit that an old guy (now sadly RIP) left me. I didn't do any saw-cuts at all on the last one.
The good thing is, the pin is tubular and using a Makita cordless drill, the drill tends to centralise quite well if you take it steady and all three pins are now totally drilled out with no significant damage to the sidewalls of the stand horizontal pivot tubes. Plenty of some fancy pants 'Wurth' drilling compound that Ben Powell gave me last night also helped a lot. We did try 3 Tonnes of force on one seized pin last night in the hydraulic press at work, with no joy, even after heating the centre tube to almost cherry red. Without making suitable adapters, it was difficult to apply any more than 3 tonnes safely.
Got one more to do for my mate in Beverley tomorrow (again CB250K) and then that's it for all of my bikes.
I do have totally a spare seized 400/4 centre stand somewhere though, so when my SDS adapters arrive, I will dig it out and try the K2-K6 (Nigel) SDS impact method.
AndyD:
Sounds a good result Ash
Spent an hour or two today getting one pin out.
SDS drill didn't do much sadly - except make all the house lights flicker as it battled the rusty pin!
Fed a good sawblade through the pin and cut through on two sides after which the pin came out easily so got there in the end.
Cheers,
Andy
AshimotoK0:
--- Quote from: AndyD on December 01, 2021, 06:33:40 PM ---Sounds a good result Ash
Spent an hour or two today getting one pin out.
SDS drill didn't do much sadly - except make all the house lights flicker as it battled the rusty pin!
Fed a good sawblade through the pin and cut through on two sides after which the pin came out easily so got there in the end.
Cheers,
Andy
--- End quote ---
Good result too Andy. The three I just did, two of them I did the two saw-cuts on but the pin was totally rusted to the stand tube along it's whole length and no amount of bashing would shift it. I drilled out from both ends and the last inch or so in the centre did drift out but even then it took a lot of force to shift the final 'plug'
taysidedragon:
--- Quote from: AshimotoK0 on December 01, 2021, 03:44:25 PM ---Well my SDS adapters haven't arrived yet, so soldiered on drilling the seized pins out.
I have now removed 3 pins in 3 off CB250/350K centre stands, by drilling out with a really nice quality drill bit that an old guy (now sadly RIP) left me. I didn't do any saw-cuts at all on the last one.
The good thing is, the pin is tubular and using a Makita cordless drill, the drill tends to centralise quite well if you take it steady and all three pins are now totally drilled out with no significant damage to the sidewalls of the stand horizontal pivot tubes. Plenty of some fancy pants 'Wurth' drilling compound that Ben Powell gave me last night also helped a lot. We did try 3 Tonnes of force on one seized pin last night in the hydraulic press at work, with no joy, even after heating the centre tube to almost cherry red. Without making suitable adapters, it was difficult to apply any more than 3 tonnes safely.
Got one more to do for my mate in Beverley tomorrow (again CB250K) and then that's it for all of my bikes.
I do have totally a spare seized 400/4 centre stand somewhere though, so when my SDS adapters arrive, I will dig it out and try the K2-K6 (Nigel) SDS impact method.
--- End quote ---
Well done Ash. You have a lot more determination than I do!
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